^ the amount of days is dependent on you. You are an adult, you have the decision to leave treatment at anytime or stay for longer if you wish and the funds are there. The key is how badly do you want to be sober? Many people enter rehab because they were given ultimatums by a partner, parent, etc. but they will easily drink again once out of rehab because the desire of stopping for themselves is not strong enough. A mere 30 days isn't a miracle that will cure you from all your problems. It will give you some tools and what you do with those tools is entirely up to you. My AH checked into rehab for 30 days, he has prolonged his stay to 60 days (on his own accord) to gain even more tools and understanding of himself so that he has a better chance of sobriety when he comes out into the real world.
As for work, that boils down to how badly do you want to quit the lifestyle you have been leading. Is it strong enough to risk your job? Many companies will completely understand and even have insurance benefits to pay their employees for their rehab program. In my opinion, getting sober, equipping yourself with knowledge, self-esteem, self-awareness is much more beneficial in the long-term than a job.